Lock.



c. G. CHAPMAN.'

LOOK.

APPLICATION FILED JAJLZS, X910.

y Patented 1811111911.

me/nto@ 'A /Zarly C @gama l oem entren CHARLES C. CHAPMAN, OF.'MEDFGRIRI OKLAHOM Specification of Letters Patent.

Patented dan. fr?, i911.

Application ledvanuary 28, 1910. Serial No. 540,683.

To all whom may concern.'

le it. known that l, Culturas C. Crue- MAN, a citizen oi the UnitedStates, residini; at Medford, in the county of Grant and State ofOklahoma, have invented new and useful Improvements in Locks, of whichthe YFollowingis a -specilicatioir The invention relates to animprovement t in locks, and is particularly directed to a lock adaptedto lic-operated by a combination or l ,a master key independent et thecombination. Y

The niain object of the present invention is the prorision oi a lockwhich may be controlled and operatedtnrough the knowl edgcof thecombination or in which the locking bolt may be shifted by a master keyindependent of the combination, whereby a number or' locks may be set onditlerL ent combinations to be operated only by the individuals knowing`such combinations and yet be capable of being opened by an authorizedperson having a master key.

The invention will be described in the following specification,reference being had particularly to the accompanying drawings, inWhich:-

Figui#` 1. is an ele 'ation of tlie lock. Fig. 2 is rear elevation Withthe rear Wall vof the casingV removed, the lock bolt being shown inprojected position. Fig. 3 is a similar vienY with the lock boltretracted by the use of the combination devices. Fig. 4 is a section online Li-'i of Fig. 3. Fig. 5 is a broken perspective or' lthe lock bolt.

Referring particularly to the accompany ing dravvings, the improved;lock includes a casing l or" any desired size," in which near therelatively rear edge are inounted the combination disk studs 2 and 3.The outer ends of these studs, are provided with operating knobs dcarrying numbered disks 5 designed to register with an annular band 6fixed upon the front Wall of the casing and carrying the usual. radiallines 7 with which the numbers on the disks 5 are to be properlyarranged for forming the co1nbi nation with which the lock is set, allot which is of the usual construction oi coinbination locks. @n thestuds 2 and 3 Within the casing are secured the lock disks 8 and 9formed in their peripheral edges with a series of indentations 10 andwith a releasing notch 1l. Mounted for movement between the disks 8 and9 is a. locking bolt made up of a bolt section 12 and a slide section13. The slide section is formed at its rear end to provide a guide strip11i designed to slide in a bracket l5 secured to the inner surface ofthe front wall of the casing,^said slide section in advance ot the guidellbeing provided with a transverse locking' bar lo, having` rearwardlyprojectt ing lugs 1T at the respective terminals. Frein the cross barthere. are forwardly projected spaced parallel bars 18, having,r their'forward ends. provided with outwardly projecting lugs il).

i The boltsection l2 of the lock comprises the usual nose end .20designed'to slide through an apertnrel. Jformell in on end 'wall of thecase in .the locking operation. The rear end of the bolt section isreduced in Width, at QQ, 'to slidably lit between the lugs i9 of theslide section, the bolt section at the rear end of the reduced portionbeing termed Awith laterally projecting lugs 23, 'which designed to rideupon the bars i8 and in the forward position of the bolt section toengage the rear surface of the lugs 19 of the slide section. The loweredge of the bolt section is provided with a key recess 24 and the faceof the casing l is formed with keyhole 25, so that in the introductionand turning ot a key the bits thereof will engage the rear Wall of therecess and retract the bolt section. A leaf spring 25 is secured in thecasingl, bearing at its fret. end in a recess termed in the boltsection,whereby the bolt section is normally projected into locking position. Atan appropriate point the casing is provided with an operating handle 27,tne stud of `which projects Within the casing and is provided with a.disk head dhaviiig a projection designed to bear n rmally upon therelatively upper edge of the reduced portion of the bolt 'sect-iondirect-ly. forward ot the relatively upper lug f olf the slide section.c

ln use 'when the combination disksv are properly set, the recesses l inthe locking disks S and 9 Will be so arranged that in .the rearwardmovement or -tlie colt as an entirety the lugs i7 of the cross bar willenter said recesses, as shown in. Fig. El. lll/hen it is desired,therefore., te operate the lock by the combination devices, the cisksthe projection 29 'to bear si, the adjacent lug 19 and move the in therea-rn ward direction. is the lugs 19 bear against the lateral lugs ofthe bolt section, said section wiil7 .in the ope lation described, be

knowledgeiof the Combination and Without the master key, or by a personhavinga key without knowledge of the combination. The lock is,therefore, particularly adaptedfor use under those conditions lin whichtwo or more persons shouid have access to the re,- cepta'cie protectedby the lock, as in post oiiice boxes, rural mail boxes, and the like,wherein it .is desirable that the individual users of the boxes controltheir locks by the: combinations known only to themselves,

whiie the proper postal authority can open any and all boxes at pleasureby the use of the master lieyE l claim l. A lock including Casing, alock bolt therefor, said bolt comprising forward 'and rear sectionsdisposed in longitudinal alinenient, the forward section being formedtoproject beyond the casing to engagethe lock lkeeper, the meeting ends ofthesections being connected to permit independent end- Wise slidingmovement of the sectlons, mannallyk adjustable means adapted when set 1na certain position to permit movement, ofy

the rear section, and means engaging the rear section in advance of theconnection between the sections to operate the bolt as an entirety, saidforward section being formed to permit its Ioperation by a keyi'ndependently of the rear section.

ZA casing, a locking bolt therefor made in sections, said sections beingarranged in i Longitudinal ialinement and their meeting `ends connectedfor independent slidingl movement, a, cross bar carried by the rearsection and terminally formedy to provide lugs, a notched disk arrangedadjacent each lug` and formed With' a reeess te receive the lug when thedisk is in a predetermined position, and means mounted in the casing toengage the rear section in advance of its connection with the forwardsection to operate the bolt as an entirety, said forward section beingformed to permit its independent operation by a key.

In testimony whereof I afix my signature in presence of two Witnesses.

oHAs. c. CHAPMAN.v Vitnesses: i

R. S. WoUDY,

donn S. ROBINSON.

